Tang Can, Zhou Yujie, Qiao Jing, Kanwal Humaira, Song Guoqian, Hao Wenfeng
College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China.
Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China.
Polymers (Basel). 2025 Aug 4;17(15):2137. doi: 10.3390/polym17152137.
Existing studies have shown that placing 3D-printed lattices in cement matrices can effectively improve the ductility of cement-based composites. However, the influence of thermal fatigue effect on the mechanical properties of 3D-printed lattice-reinforced cement-based composites during service remains to be studied. In this paper, cement-based materials without lattices were used as the control group, and the uniaxial compressive mechanical properties of 3D-printed lattice-reinforced cement-based composites after thermal fatigue treatment under a temperature difference of 60 °C were tested. The number of thermal fatigue cycles was set to 45, 90, and 145 times, respectively. During the test, two non-destructive testing technologies, AE and DIC, were used to analyze the strength degradation and deformation law of 3D-printed lattice-reinforced cement-based composites with the increase in cycles. AE adopted the threshold triggering mode, and the channel threshold was 100 mv. The experiment showed that the compressive strength of the control group after 45, 90, and 145 thermal cycles decreased to 72.47% and 49.44% of that of the specimen after 45 thermal cycles, respectively. The strength of RO lattices decreased to 91.07% and 82.14% of that of the specimen after 45 thermal cycles, respectively, while the strength of SO lattices decreased to 83.27% and 77.96% of that of the specimen after 45 thermal cycles, respectively. The compressive strengths of the two types of lattices were higher than that of the control group after three cycles, indicating that 3D-printed lattices can effectively mitigate the influence of environmental thermal fatigue on the mechanical properties of cement-based materials.
现有研究表明，在水泥基体中放置3D打印晶格可以有效提高水泥基复合材料的延性。然而，热疲劳效应在服役期间对3D打印晶格增强水泥基复合材料力学性能的影响仍有待研究。本文以无晶格的水泥基材料作为对照组，测试了3D打印晶格增强水泥基复合材料在60℃温差下热疲劳处理后的单轴压缩力学性能。热疲劳循环次数分别设置为45次、90次和145次。试验过程中，采用声发射（AE）和数字图像相关（DIC）两种无损检测技术，分析3D打印晶格增强水泥基复合材料强度退化和变形规律随循环次数的增加情况。AE采用阈值触发模式，通道阈值为100mv。试验表明，对照组在经历45次、90次和145次热循环后，抗压强度分别降至45次热循环后试件抗压强度的72.47%和49.44%。RO晶格的强度分别降至45次热循环后试件强度的91.07%和82.14%，而SO晶格的强度分别降至45次热循环后试件强度的83.27%和77.96%。两种晶格的抗压强度在三个循环后均高于对照组，表明3D打印晶格可有效减轻环境热疲劳对水泥基材料力学性能的影响。
